Plasma display panel for multi-screen system

ABSTRACT

This invention discloses a plasma display panel for multi-screen system. The plasma display panel (10) comprises the upper dielectric plate (1) and the lower dielectric plate (2). Cathode electrode (3) and anode electrode (4) are orthogonally located between said plates (1) and (2). These electrodes (3) and (4) form display cell (5) and (6), the cell (5) being formed between barrier ribs (8) and the cell (6) being adjacent to one side of sealing seam (7). The display cells (5) and (6) are separated by barrier ribs (8). The display cell (6) adjacent to the sealing seam are made of a size increasing in direction perpendicular to the sealing seam (7) with respect to the rest of the display cell (5).

TECHNICAL FIELD

The present invention relates to a structure of a plasma display paneland more particularly, to a structure of a plasma display panel formulti-screen system in which the display cells adjacent to the sealingseas of the panel are made of a size increasing in the directionperpendicular to the sealing seam with respect to the rest of thedisplay cells thereby reducing a distortion of information displayed onthe screen.

BACKGROUND ART

The most similar prior art in technical essence to this invention is theplasma display panel disclosed in USSR Patent No. 1074301 (Mar. 30,1982). This plasma display panel comprises upper and lower plates andsystems of mutually orthogonal electrodes, in which display cellsadjacent to the sealing seam are formed by hollows of grooves, and anexternal sealing element is separated from internal cell volume by alight-translucent element with a round cross-section inserted into thehollow and located around the edges.

However, the disadvantages of the USSR patent is in a loss of a pitch atthe place of joint of panels because of large thickness of the sealingseam and which results in a distortion of the information displayed onthe screen.

DISCLOSURE OF THE INVENTION

Accordingly, in consideration of the disadvantages of the describedpatent, the main object of the present invention is to provide a plasmadisplay panel having an improved information quality by eliminating aninformation distortion at the place of the panel sealing parts.

To accomplish the object, the present invention comprises upper andlower dielectric plates, cathode and anode electrodes orthogonallylocated between said plates, display cells defined by said electrodes,barrier ribs for seperating and defining display cells from each otherand sealing seam for sealing edge parts of said two plates, in which thedisplay cells adjacent to the sealing seam are made of a size increasingin direction perpendicular to the sealing seam with respect to the restof the display cells.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic view depicting the plasma display panel for PDPmulti-screen system.

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1, PDP (10) comprises the upper dielectric plate(1) and thelower dielectric plate (2). Cathode electrode(3) and anode electrode(4)are orthogonally located between said plates (1) and (2). Theseelectrodes (3) and (4) form display cell (5) and (6), the cell (5) beingformed between barrier ribs (8) and thew cell (6) being adjacent to oneside of sealing seam (7). The display cells (5) and (6) are separated bybarrier ribs (8).

As depicted, the horizental length of display cell (6) adjacent tosealing seam (7) is more long than the horizental length of display cell(5) being formed between barrier ribs (8) and that the following ratioshould be observed:

    0.5(hs-hc)+lm≦le≦(hs-hc)+lm

le: size of cell (6) adjacent to the sealing seam (7);

lm: size of cell (5)

hs: width of sealing seam (7);

hc: width of barrier rib (8) between cells (5);

For example, if size of cell(5) is 1.2×2 mm, width of sealing seam (7)is 1.5 mm and width of barrier ribs (8) between cells (5) is 1.5 mm,size of cell (6) adjacent to the sealing seam (7) becomes 2.7 mm.

Increasing of size of cell (6) adjacent to the sealing seam (7) withinthe limits of given ratio results in keeping of specific light fluxconstant in the centre of panels and the place of their joints and itassists to create more favourable conditions for an operator to read thescreen information.

When making size of cells (6) adjacent to the sealing seam (7)le≧(hs-hc)+lm, an intensified light occurs in the region of the sealingseam being provoked by light flux increase of more than 30% andresulting in information perception with distortion.

When making size of cells (6) adjacent to the sealing seam (7)le≦(hs-hc)+lm, a loss of information takes place as a result of lightflux reduction coming from cell adjacent to the sealing by more than30%.

±30% is permissable limit of screen non-uniform light for DC-type plasmadisplay panels required for normal perception of information on thescreen.

As above mentioned, this invention allows to eliminate video-informationdistortion in multi-screen system in places of panel joints and itresults in quality improvement of information displayed.

We claim:
 1. A plasma display panel for multi-screen systemcomprising:upper and lower dielectric plates; cathode and anodeelectrodes orthogonally located between said plates; display cellsdefined by said electrodes; barrier ribs for separating and definingdisplay cells from each other; and a sealing seam for sealing edge partsof said two plates, wherein the length in a direction perpendicular tothe sealing seam of the display cells adjacent to the sealing seam isgreater than that of the rest of the display cells.
 2. A plasma displaypanel according to claim 1 wherein a size ratio between display cellsadjacent to the sealing seam and the rest of the display cells isexpressed by the following equation:

    0.5(hs-hc)+lm≦le≦(hs-hc)+lm

le: size of cell adjacent to the sealing seam; lm: size of cell; hs:width of sealing seam; hc: width of barrier rib between cells.